AP BIOLOGY

Detailed explanation-1: -Key enzyme involved in DNA replication, it is responsible for ‘unzipping’ the double helix structure by breaking the hydrogen bonds between bases on opposite strands of the DNA molecule.

Detailed explanation-2: -DNA helicases catalyze the disruption of the hydrogen bonds that hold the two strands of double-stranded DNA together. This energy-requiring unwinding reaction results in the formation of the single-stranded DNA required as a template or reaction intermediate in DNA replication, repair and recombination.

Detailed explanation-3: -Helicases are involved in virtually all cellular processes that involve DNA and RNA. Their claim to fame, though, is unwinding DNA so it can be copied during cell division.

Detailed explanation-4: -Explanation: DNA helicase unwinds the double helix, separating the two strands so they may be replicated by DNA polymerase. Primase adds an RNA primer to help initiate DNA replication. DNA ligase is responsible for joining Okazaki fragments on the lagging strand during replication.